Reference table, 42 figures
Body fat by waist and neck circumference
This table shows the U.S. Navy method body-fat estimate for a male at 180 cm across waist (72–108 cm) and neck (34–44 cm) circumference. For example, a 90 cm waist with a 38 cm neck estimates 19.8% — the “Average” range.
Every value below is computed live from the Body Fat calculator engine. Read the methodology for the circumference formula, or the lean body mass calculator.
Body-fat grid: waist rows × neck columns
U.S. Navy body fat (%), male, 180 cm. Rows: waist (cm). Columns: neck (cm).
| Waist \ Neck | 34 | 36 | 38 | 40 | 42 | 44 |
|---|---|---|---|---|---|---|
| 72 | 8.5 | 6.6 | 4.6 | 2.5 | 0.3 | -2.0 |
| 78 | 13.7 | 12.1 | 10.3 | 8.5 | 6.6 | 4.6 |
| 84 | 18.4 | 16.9 | 15.3 | 13.7 | 12.1 | 10.3 |
| 90 | 22.6 | 21.2 | 19.8 | 18.4 | 16.9 | 15.3 |
| 96 | 26.4 | 25.2 | 23.9 | 22.6 | 21.2 | 19.8 |
| 102 | 29.9 | 28.8 | 27.6 | 26.4 | 25.2 | 23.9 |
| 108 | 33.2 | 32.1 | 31.1 | 29.9 | 28.8 | 27.6 |
Cells are estimated body-fat percentage by the U.S. Navy circumference method. A larger waist raises the estimate; a thicker neck lowers it (the neck stands in for lean upper-body mass). Height is fixed at 180 cm.
How the table is made
- Engine
- Body Fat Percentage Calculator (body-fat-percentage-calculator)
- Source
- Computed live from /engines/body-fat-percentage-calculator.js
- Rows
- Waist: 72, 78, 84, 90, 96, 102, 108 cm
- Columns
- Neck: 34, 36, 38, 40, 42, 44 cm
- Fixed inputs
- sex = male, height = 180 cm
- Size
- 7 × 6 = 42 cells
- Each figure
- body fat (%) — U.S. Navy method
- Grid last changed
- , recomputed on every build
The engine is deterministic, with no clock and no randomness, so each cell reproduces exactly on every build. The full grid is embedded as machine-readable JSON and recomputed by our CI gate against a fresh engine run; the table and CSV are rendered from those same outputs, never hand-entered.